<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文本阴影</title>
    <style>
        h1 {
            text-shadow: 2px 2px 5px red;
        }
    </style>
</head>
<body>
<h1>文本阴影</h1>
</body>
</html>